Trading in the shares of Norsk Data A/S was suspended on the Oslo stock exchange on Friday because foreign ownership has apparently exceeded the permitted 45% and is now around 47%: reason is of course that the shares are traded in London, New York and on several other exchanges and the company is an attractive play; it is likely that Norsk Data will have to issue new shares in Norway to bring the ratio back below 45%, and more stringent controls to prevent Norwegian-held shares passing into foreign hands.